self Maths Puzzle

8men and 10women can do work in 25 days,the same work can be done by 10children and 5 women.in how many days can 2 children and 3 men do the same work.

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self Other Question

a number when divided by D leaves remainder of 3 and when divided by 3D leaves a reminder of 21.what is the remainder left,when twice the number is divided by 3D? 1,11,21,1211,111221,?